MLA

Murphy, Gerald, 1888-1964. Nicholas, Archbishop of Serbia. Box 7, folder 121. 1937-1941. https://collections.library.yale.edu/catalog/17154384.

APA, 6th edition

Murphy, Gerald, 1888-1964. (["Box 7, folder 121"])(1937-1941)[Nicholas, Archbishop of Serbia]. https://collections.library.yale.edu/catalog/17154384.